Viscoelasticity and mass transfer in phenol–CTAB aqueous systems |
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Authors: | Dharmesh Varade Carlos Rodríguez-Abreu José Gregorio Delgado Kenji Aramaki |
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Institution: | (1) Graduate School of Environment and Information Sciences, Yokohama National University, Tokiwadai 79-7, Hodogaya-ku, Yokohama 240-8501, Japan;(2) Institut d`Investigacions Químiques i Ambientals de Barcelona (IIQAB/CSIC), Jordi Girona, 18-26, 08034 Barcelona, Spain;(3) Escuela de Ingeniería Química, Universidad de Los Andes, Mérida, 5101, Venezuela |
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Abstract: | The rheological and mass transport properties of phenol in micellar solutions of hexadecyltrimethylammonium bromide (CTAB)
were studied by rheometry and spectrophotometry. The presence of phenol located between headgroups of the CTAB diminishes
the repulsive forces between the cationic groups and induces a sharp increase in viscosity that is attributed to the one-dimensional
micellar growth favoring the formation of worm-like micelles. It is found that the mass transfer of phenol between two immiscible
phases is significantly retarded by the presence of CTAB. The transfer is particularly slow when the diffusion takes place
from a surfactant solution phase to an organic phase. This behavior is attributed to the phenol–surfactant interaction that
leads to micellar growth and viscoelastic behavior. However, at elevated temperature, viscosity decreases and mass transfer
increases. This particular rheological behavior offers the possibility of regulating the mass transfer, which might be interesting
for applications. |
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Keywords: | Rheometry Worm-like Viscoelasticity Spectrophotometry Mass transfer |
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